Threaded fittings

[kwired]

I don't believe there is any difference.

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Ampacity/derating no, fill - there is fill tables for each different tubular raceway type in chapter 9. Back before ~1996 or maybe 1999 NEC they did just have one chart for all types except Sch 80 PVC, you did have to get the CSA off the conduit itself - it was marked, most still is I think.

 

[Seandb1986]

So per spec were allowed to use EMT in the slab But it can’t have threadless fittings. Can you use a threaded coupling with EMT? But then you need to thread the EMT Which I don’t think can be done as it’s thinwall.

Emt in concrete needs emt compression fittings rated concrete tight.

 

[cadpoint]

PVC coated Aluminum for the nasty wet concrete areas.

 

[infinity]

Emt in concrete needs emt compression fittings rated concrete tight.

Many set screw EMT fittings are listed as concrete tight when taped around the fitting.